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Smack/source/org/jivesoftware/smackx/packet/DefaultPrivateData.java

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/**
* $RCSfile$
* $Revision$
* $Date$
*
* Copyright (C) 2002-2003 Jive Software. All rights reserved.
* ====================================================================
* The Jive Software License (based on Apache Software License, Version 1.1)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by
* Jive Software (http://www.jivesoftware.com)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Smack" and "Jive Software" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please
* contact webmaster@jivesoftware.com.
*
* 5. Products derived from this software may not be called "Smack",
* nor may "Smack" appear in their name, without prior written
* permission of Jive Software.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL JIVE SOFTWARE OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*/
package org.jivesoftware.smackx.packet;
import java.util.Map;
import java.util.Iterator;
import java.util.Collections;
import java.util.HashMap;
/**
* Default implementation of the PrivateData interface. Unless a PrivateDataProvider
* is registered with the PrivateDataManager class, instances of this class will be
* returned when getting private data.<p>
*
* This class provides a very simple representation of an XML sub-document. Each element
* is a key in a Map with its CDATA being the value. For example, given the following
* XML sub-document:
*
* <pre>
* &lt;foo xmlns="http://bar.com"&gt;
* &lt;color&gt;blue&lt;/color&gt;
* &lt;food&gt;pizza&lt;/food&gt;
* &lt;/foo&gt;</pre>
*
* In this case, getValue("color") would return "blue", and getValue("food") would
* return "pizza". This parsing mechanism mechanism is very simplistic and will not work
* as desired in all cases (for example, if some of the elements have attributes. In those
* cases, a custom PrivateDataProvider should be used.
*
* @author Matt Tucker
*/
public class DefaultPrivateData implements PrivateData {
private String elementName;
private String namespace;
private Map map;
/**
* Creates a new generic private data object.
*
* @param elementName the name of the element of the XML sub-document.
* @param namespace the namespace of the element.
*/
public DefaultPrivateData(String elementName, String namespace) {
this.elementName = elementName;
this.namespace = namespace;
}
/**
* Returns the XML element name of the private data sub-packet root element.
*
* @return the XML element name of the packet extension.
*/
public String getElementName() {
return elementName;
}
/**
* Returns the XML namespace of the private data sub-packet root element.
*
* @return the XML namespace of the packet extension.
*/
public String getNamespace() {
return namespace;
}
public String toXML() {
StringBuffer buf = new StringBuffer();
buf.append("<").append(elementName).append(" xmlns=\"").append(namespace).append("\">");
for (Iterator i=getNames(); i.hasNext(); ) {
String name = (String)i.next();
String value = getValue(name);
buf.append("<").append(name).append(">");
buf.append(value);
buf.append("</").append(name).append(">");
}
buf.append("</").append(elementName).append(">");
return buf.toString();
}
/**
* Returns an Iterator for the names that can be used to get
* values of the private data.
*
* @return an Iterator for the names.
*/
public synchronized Iterator getNames() {
if (map == null) {
return Collections.EMPTY_LIST.iterator();
}
return Collections.unmodifiableMap(new HashMap(map)).keySet().iterator();
}
/**
* Returns a value given a name.
*
* @param name the name.
* @return the value.
*/
public synchronized String getValue(String name) {
if (map == null) {
return null;
}
return (String)map.get(name);
}
/**
* Sets a value given the name.
*
* @param name the name.
* @param value the value.
*/
public synchronized void setValue(String name, String value) {
if (map == null) {
map = new HashMap();
}
map.put(name, value);
}
}